body{
    margin:0;
}
header{
    width: 100%;
    height: 45px;
    background-color: #b52221;
    text-align: center;
}
header span{
    line-height: 45px;
    color: #fff;
}
ul{
    width:90%;
    margin: 0 auto 0 auto;

}
ul:after{
    content: "";
    display: block;
    clear: both;
}
ul li{
    list-style: none;
    float: left;
    width: 33.3%;
    font-size:0px;
    text-align: center; 
}
ul li img{
    margin: 8px;
    box-shadow: 0 0 4px #000;
}
footer {
    text-align: center;
    margin-top: 10px;
}